Sources:
- Colin Rallings and Michael Thrasher, British Electoral Facts 1832-2006
- House of Commons Library – Turnout at elections
| Date | Party forming government | Initial Prime Minister |
|---|---|---|
| 27/10/1931 | National Government | Ramsay MacDonald |
| 14/11/1935 | National Government | Stanley Baldwin |
| 05/07/1945 | Labour | Clement Attlee |
| 23/02/1950 | Labour | Clement Attlee |
| 25/10/1951 | Conservative | Sir Winston Churchill |
| 26/05/1955 | Conservative | Sir Anthony Eden |
| 08/10/1959 | Conservative | Harold Macmillan |
| 15/10/1964 | Labour | Harold Wilson |
| 31/03/1966 | Labour | Harold Wilson |
| 18/06/1970 | Conservative | Edward Heath |
| 28/02/1974 | Labour | Harold Wilson |
| 10/10/1974 | Labour | Harold Wilson |
| 03/05/1979 | Conservative | Margaret Thatcher |
| 09/06/1983 | Conservative | Margaret Thatcher |
| 11/06/1987 | Conservative | Margaret Thatcher |
| 09/04/1992 | Conservative | John Major |
| 01/05/1997 | Labour | Tony Blair |
| 07/06/2001 | Labour | Tony Blair |
| 05/05/2005 | Labour | Tony Blair |
| 06/05/2010 | Coalition | David Cameron |
| 07/05/2015 | Conservative | David Cameron |
| 08/06/2017 | Conservative | Theresa May |
| 12/12/2019 | Conservative | Boris Johnson |
